// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
 * Copyright (C) 2015-2016 Samsung Electronics
 *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
 *               Krzysztof Opasiak <k.opasiak@samsung.com>
 */

#include <linux/device.h>
#include <linux/list.h>
#include <linux/module.h>

#include "vudc.h"

static unsigned int vudc_number = 1;

module_param_named(num, vudc_number, uint, S_IRUGO);
MODULE_PARM_DESC(num, "number of emulated controllers");

static struct platform_driver vudc_driver = {
        .probe          = vudc_probe,
        .remove         = vudc_remove,
        .driver         = {
                .name   = GADGET_NAME,
                .dev_groups = vudc_groups,
        },
};

static LIST_HEAD(vudc_devices);

static int __init vudc_init(void)
{
        int retval = -ENOMEM;
        int i;
        struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;

        if (usb_disabled())
                return -ENODEV;

        if (vudc_number < 1) {
                pr_err("Number of emulated UDC must be no less than 1");
                return -EINVAL;
        }

        retval = platform_driver_register(&vudc_driver);
        if (retval < 0)
                goto out;

        for (i = 0; i < vudc_number; i++) {
                udc_dev = alloc_vudc_device(i);
                if (!udc_dev) {
                        retval = -ENOMEM;
                        goto cleanup;
                }

                retval = platform_device_add(udc_dev->pdev);
                if (retval < 0) {
                        put_vudc_device(udc_dev);
                        goto cleanup;
                }

                list_add_tail(&udc_dev->dev_entry, &vudc_devices);
                if (!platform_get_drvdata(udc_dev->pdev)) {
                        /*
                         * The udc was added successfully but its probe
                         * function failed for some reason.
                         */
                        retval = -EINVAL;
                        goto cleanup;
                }
        }
        goto out;

cleanup:
        list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
                list_del(&udc_dev->dev_entry);
                /*
                 * Just do platform_device_del() here, put_vudc_device()
                 * calls the platform_device_put()
                 */
                platform_device_del(udc_dev->pdev);
                put_vudc_device(udc_dev);
        }

        platform_driver_unregister(&vudc_driver);
out:
        return retval;
}
module_init(vudc_init);

static void __exit vudc_cleanup(void)
{
        struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;

        list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
                list_del(&udc_dev->dev_entry);
                /*
                 * Just do platform_device_del() here, put_vudc_device()
                 * calls the platform_device_put()
                 */
                platform_device_del(udc_dev->pdev);
                put_vudc_device(udc_dev);
        }
        platform_driver_unregister(&vudc_driver);
}
module_exit(vudc_cleanup);

MODULE_DESCRIPTION("USB over IP Device Controller");
MODULE_AUTHOR("Krzysztof Opasiak, Karol Kosik, Igor Kotrasinski");
MODULE_LICENSE("GPL");